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Master Cylinder Rebuild and Replacement- Soft brake pedal by Dennis LaGrua
Started on: 05-16-2014 04:22 PM
Replies: 2 (586 views)
Last post by: uhlanstan on 05-17-2014 09:49 AM
Dennis LaGrua
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Report this Post05-16-2014 04:22 PM Click Here to See the Profile for Dennis LaGruaClick Here to Email Dennis LaGruaSend a Private Message to Dennis LaGruaEdit/Delete MessageReply w/QuoteDirect Link to This Post
Still can't find the cause of the soft brake pedal. Recent rebuilt calipers, all new pads, no leaks and several bleeds have not remedied the problem. Since all else has failed, pulled and rebuilt the master cylinder today with a $9.99 Wagner rebuild kit purchased a while ago from Rock Auto. The rebuild went easy as the bore was clean and pitt free. As long as you work in a very clean environment and install the seals with the lips in the correct positions, the rebuild is at most a 30 minute job. Now to bleed the cylinder, install it and then try to figure out how to best bleed while dealing with the proportioning valve. You cannot use a pressure bleeder on the plastic reservoirs used on Fiero master cylinders so I guess the Mightvac and or gravity bleed is the tool. Anyone have any special tips to share?

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84fiero123
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Report this Post05-17-2014 09:20 AM Click Here to See the Profile for 84fiero123Click Here to Email 84fiero123Send a Private Message to 84fiero123Edit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by Dennis LaGrua:
You cannot use a pressure bleeder on the plastic reservoirs used on Fiero master cylinders so I guess the Mightvac and or gravity bleed is the tool. Anyone have any special tips to share?



Why Not? people do it all the time.



Steve

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Technology is great when it works,
and one big pain in the ass when it doesn't



Detroit iron rules all the rest are just toys.

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uhlanstan
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Report this Post05-17-2014 09:49 AM Click Here to See the Profile for uhlanstanClick Here to Email uhlanstanSend a Private Message to uhlanstanEdit/Delete MessageReply w/QuoteDirect Link to This Post
I have had a lot of trouble bleeding Fiero brakes ,you need to use some sort of power bleeder,just do not get carried away
with force
pushing a lot of fluid thru does not seem to work..
you have to avoid pushing pedal all the way down,once you get some firm pedal
you do have to purge the master cylinder,push it down & hold then release front master cylinder pressure ,retighen quickly.then do rear line
I do this alone & use a stick to hold the pedal down,it is very important on the fiero to purge ALL air from the master
I do not bench bleed ,I install & do it on the car !!
My other car is an 89 Jimmy bleeds easily the first time
the one way bleed valves help some times ..
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